Synchronization signal transmission method, apparatus and system

Abstract

Embodiments of the present application provide a synchronization signal transmission method, apparatus and system, used for being compatible with synchronization signals of different types of terminal devices. The method comprises: determining a synchronization signal comprising multiple sub-sequences, wherein each sub-sequence among the multiple sub-sequences is mapped to a sub-carrier of orthogonal frequency division multiplexing (OFDM), and the bandwidth of the synchronization signal is greater than or equal to the bandwidth of any one sub-sequence among the multiple sub-sequences; and transmitting the synchronization signal to a terminal device, wherein the synchronization signal is used for the terminal device to execute downlink synchronization.

Description

Synchronization signal transmission method, device and system

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on November 14, 2023, with application number 202311524713.3 and application name “Method, device and system for transmitting synchronization signals”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communication technology, and in particular to a method, device, and system for transmitting a synchronization signal. Background Art

[0003] In order to successfully enable the terminal device to initially access the cellular network, the network device will periodically send a synchronization signal to the terminal device. For example, when the cellular network is a long term evolution (LTE) network or a new radio (NR) network, the synchronization signal may include a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), and the network device will also periodically send a physical broadcast channel (PBCH) to the terminal device. In the NR system, the synchronization signal and PBCH can be collectively referred to as a synchronization signal and a physical broadcast channel block (SSB).

[0004] Currently, cellular networks support both broadband and narrowband devices, such as narrowband Internet of Things (NB-IoT) devices. The synchronization signals for broadband devices have a wider bandwidth, exceeding the frequency range that narrowband devices can receive. Consequently, narrowband devices are unable to properly receive these synchronization signals. Therefore, different synchronization signals are designed for broadband and narrowband devices, which increases the complexity of cellular network system design.

[0005] Summary of the Invention

[0006] The embodiments of the present application provide a method, apparatus, and system for transmitting synchronization signals, which are used to implement synchronization signals compatible with different types of terminal devices.

[0007] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0008] In a first aspect, a method for transmitting a synchronization signal is provided. The apparatus performing the method may be a network device, or a module employed in the network device, such as a chip or chip system. The method for transmitting a synchronization signal includes: determining a synchronization signal comprising multiple subsequences, the multiple subsequences constituting a long sequence, each of the multiple subsequences being mapped to a subcarrier of orthogonal frequency division multiplexing (OFDM), and the bandwidth of the synchronization signal being greater than or equal to the bandwidth of any subsequence in the multiple subsequences; and transmitting the synchronization signal to a terminal device, the synchronization signal being used by the terminal device to perform downlink synchronization.

[0009] In the synchronization signal transmission method provided in the embodiments of the present application, the synchronization signal can include multiple subsequences, so that a broadband terminal device can receive the synchronization signal including all subsequences, and a narrowband terminal device can receive one or more subsequences within the synchronization signal. The embodiments of the present application can employ the same synchronization signal transmission structure for both broadband and narrowband terminal devices, thereby reducing the complexity of cellular network system design and achieving the technical effect of conserving time and frequency resources.

[0010] In conjunction with the first aspect above, in one possible implementation, the number of subsequences included in the synchronization signal is equal to the length of each subsequence included in the synchronization signal. Simulation results show that in this solution, the subsequences have good ambiguity function performance. Specifically, the correlation value of the sequence has low sidelobes corresponding to erroneous delays and / or Doppler frequency offsets.

[0011] In combination with the above first aspect, in a possible implementation manner, the subsequence included in the synchronization signal is a longest linear shift register sequence or a multi-phase sequence.

[0012] In combination with the first aspect above, in a possible implementation, the first subsequence included in the synchronization signal is a polyphase sequence; and the general term of the first subsequence satisfies the following formula:

[0013] Where a, b, c, d, p, and q are constants; n = 1, 2, ..., N, where N represents the length of the first subsequence and is a positive integer; k = 1, 2, ..., K, where K represents the number of subsequences included in the synchronization signal and is a positive integer. In particular, p = 3 and q = 2.

[0014] In combination with the above first aspect, in a possible implementation, the synchronization signal includes a primary synchronization signal PSS and / or a secondary synchronization signal SSS.

[0015] In conjunction with the first aspect above, in one possible implementation, the number of subsequences included in the PSS is the same as the number of subsequences included in the SSS, and / or the length of each subsequence included in the synchronization signal is the same. In this solution, the PSS and SSS may have the same number and / or length of subsequences. This enables terminal devices, particularly second-type terminal devices, to receive PSS and SSS with comparable performance.

[0016] In conjunction with the first aspect above, in one possible implementation, each subsequence included in the PSS or SSS occupies the same time domain resources. In this solution, the multiple subsequences included in the PSS or SSS can be mapped to multiple consecutive subcarriers of OFDM. Because the long sequence included in the synchronization signal in the existing synchronization signal transmission method is mapped to multiple consecutive subcarriers of OFDM, this solution can increase compatibility with existing synchronization signal transmission methods.

[0017] In conjunction with the first aspect above, in one possible implementation, each subsequence included in the PSS occupies the same time domain resources, and each subsequence included in the SSS occupies the same frequency domain resources. In this solution, for terminal devices, especially the second type of terminal devices, the SSS may not be restricted by bandwidth, so that the SSS can include more subsequences, or the SSS can carry more information.

[0018] In conjunction with the first aspect above, in one possible implementation, the method further includes: transmitting a first physical broadcast channel (PBCH); wherein the bandwidth occupied by the first PBCH is greater than or equal to the bandwidth occupied by the synchronization signal. In this solution, separate PBCHs can be designed for two different types of terminal devices. Because the first PBCH occupies more frequency domain resources, it is suitable for broadband terminal devices.

[0019] In combination with the above-mentioned first aspect, in a possible implementation manner, the frequency domain resources occupied by the first PBCH include the frequency domain resources occupied by the synchronization signal.

[0020] In conjunction with the first aspect above, in one possible implementation, the method further includes: transmitting a second PBCH; wherein the bandwidth occupied by the first PBCH is wider than the bandwidth occupied by the second PBCH. In this solution, separate PBCHs can be designed for two different types of terminal devices. Because the second PBCH occupies fewer frequency domain resources, it is suitable for narrowband terminal devices.

[0021] In combination with the above-mentioned first aspect, in a possible implementation manner, the frequency domain resources occupied by the synchronization signal include the frequency domain resources occupied by the second PBCH.

[0022] In conjunction with the first aspect above, in one possible implementation, the synchronization signal includes indication information, where the indication information is used to indicate the time domain resources and / or frequency domain resources occupied by the second PBCH. In this solution, the time and frequency resource location of the second PBCH can be flexible, and the synchronization signal can carry more information.

[0023] In conjunction with the first aspect above, in one possible implementation, the synchronization signal includes a beam index, which is used by the terminal device to send data and / or signaling on the beam corresponding to the beam index. This solution can be applied to non-initial access of a terminal device, for example, when the terminal device requests access to a network device again after terminating sleep. In this case, the terminal device does not need to receive the PBCH and can directly send data and / or signaling to the network device on the beam corresponding to the beam index, thereby achieving a technical effect of energy saving.

[0024] In a second aspect, a method for transmitting a synchronization signal is provided. The apparatus for performing the method for transmitting the synchronization signal may be a terminal device, or may be a module applied to the terminal device, such as a chip or a chip system. The method for transmitting the synchronization signal comprises: when the terminal device is a terminal device of the first type, receiving a synchronization signal from a network device, the synchronization signal comprising a plurality of subsequences, the plurality of subsequences constituting a long sequence, each of the plurality of subsequences being mapped to a subcarrier of orthogonal frequency division multiplexing (OFDM), and the bandwidth of the synchronization signal being greater than or equal to the bandwidth of any one of the plurality of subsequences; performing downlink synchronization according to the synchronization signal; or, when the terminal device is a terminal device of the second type, receiving one or more subsequences in the synchronization signal from the network device; performing downlink synchronization according to one or more subsequences in the synchronization signal; wherein the bandwidth of the signal received by the terminal device of the first type is wider than the bandwidth of the signal received by the terminal device of the second type.

[0025] In combination with the second aspect above, in a possible implementation manner, the number of subsequences included in the synchronization signal is the same as the length of each subsequence included in the synchronization signal.

[0026] In combination with the second aspect above, in a possible implementation, the subsequence included in the synchronization signal is a longest linear shift register sequence or a multi-phase sequence.

[0027] In conjunction with the above second aspect, in a possible implementation, the first subsequence included in the synchronization signal is a multi-phase sequence; and the general term of the first subsequence satisfies the following formula:

[0028] Among them, a, b, c, d, p, q are constants; n=1, 2, ..., N, N represents the length of the first subsequence, and N is a positive integer; k=1, 2, ..., K, K represents the number of subsequences included in the synchronization signal, and K is a positive integer.

[0029] In combination with the above second aspect, in a possible implementation, the synchronization signal includes a primary synchronization signal PSS and / or a secondary synchronization signal SSS.

[0030] In combination with the above second aspect, in a possible implementation, the number of subsequences included in the PSS is the same as the number of subsequences included in the SSS, and / or the length of each subsequence included in the synchronization signal is the same.

[0031] In combination with the above second aspect, in a possible implementation manner, each subsequence included in the PSS or the SSS occupies the same time domain resources.

[0032] In combination with the above second aspect, in a possible implementation manner, each subsequence included in the PSS occupies the same time domain resources, and each subsequence included in the SSS occupies the same frequency domain resources.

[0033] In combination with the above second aspect, in a possible implementation, the terminal device is a first type of terminal device; the method also includes: receiving a first PBCH; wherein the bandwidth occupied by the first PBCH is wider than or equal to the bandwidth occupied by the synchronization signal.

[0034] In combination with the above second aspect, in a possible implementation manner, the frequency domain resources occupied by the first PBCH include the frequency domain resources occupied by the synchronization signal.

[0035] In combination with the above second aspect, in a possible implementation, the terminal device is a second type of terminal device; the method further includes: receiving a second PBCH; wherein the bandwidth occupied by the first PBCH is wider than the bandwidth occupied by the second PBCH.

[0036] In combination with the above second aspect, in a possible implementation manner, the frequency domain resources occupied by the synchronization signal include the frequency domain resources occupied by the second PBCH.

[0037] In combination with the above second aspect, in a possible implementation manner, the synchronization signal includes indication information, where the indication information is used to indicate the time domain resources and / or frequency domain resources occupied by the second PBCH.

[0038] In combination with the above-mentioned second aspect, in a possible implementation method, the synchronization signal includes a beam index, and the beam index is used by the terminal device to send data and / or signaling to the network device on the beam corresponding to the beam index.

[0039] In a third aspect, a communication device is provided for implementing the above method. The communication device includes modules, units, or means corresponding to the above method. The modules, units, or means can be implemented in hardware, software, or by hardware executing corresponding software implementations. The hardware or software includes one or more modules or units corresponding to the above functions.

[0040] In conjunction with the third aspect above, in one possible implementation, the communication device includes: a synchronization signal determination module and a transceiver module. The synchronization signal determination module is configured to determine a synchronization signal including multiple subsequences, where the multiple subsequences constitute a long sequence, each of the multiple subsequences is mapped to a subcarrier of orthogonal frequency division multiplexing (OFDM), and the bandwidth of the synchronization signal is greater than or equal to the bandwidth of any subsequence in the multiple subsequences; and the transceiver module is configured to send the synchronization signal to a terminal device, where the synchronization signal is used by the terminal device to perform downlink synchronization.

[0041] In combination with the third aspect above, in a possible implementation manner, the number of subsequences included in the synchronization signal is the same as the length of each subsequence included in the synchronization signal.

[0042] In combination with the third aspect above, in a possible implementation, the subsequence included in the synchronization signal is a longest linear shift register sequence or a multi-phase sequence.

[0043] In conjunction with the third aspect, in a possible implementation, the first subsequence included in the synchronization signal is a multi-phase sequence; and the general term of the first subsequence satisfies the following formula:

[0044] Among them, a, b, c, d, p, q are constants; n=1, 2, ..., N, N represents the length of the first subsequence, and N is a positive integer; k=1, 2, ..., K, K represents the number of subsequences included in the synchronization signal, and K is a positive integer.

[0045] In combination with the third aspect above, in a possible implementation, the synchronization signal includes a primary synchronization signal PSS and / or a secondary synchronization signal SSS.

[0046] In combination with the third aspect above, in a possible implementation, the number of subsequences included in the PSS is the same as the number of subsequences included in the SSS, and / or the length of each subsequence included in the synchronization signal is the same.

[0047] In combination with the third aspect above, in a possible implementation, each subsequence included in the PSS or the SSS occupies the same time domain resources.

[0048] In combination with the third aspect above, in a possible implementation, each subsequence included in the PSS occupies the same time domain resources, and each subsequence included in the SSS occupies the same frequency domain resources.

[0049] In combination with the third aspect above, in a possible implementation, the transceiver module is further configured to send a first physical broadcast channel PBCH; wherein the bandwidth occupied by the first PBCH is wider than or equal to the bandwidth occupied by the synchronization signal,

[0050] In combination with the third aspect above, in a possible implementation, the frequency domain resources occupied by the first PBCH include the frequency domain resources occupied by the synchronization signal.

[0051] In combination with the third aspect above, in a possible implementation, the transceiver module is further configured to send a second PBCH; a bandwidth occupied by the first PBCH is wider than a bandwidth occupied by the second PBCH.

[0052] In combination with the third aspect above, in a possible implementation, the frequency domain resources occupied by the synchronization signal include the frequency domain resources occupied by the second PBCH.

[0053] In combination with the third aspect above, in a possible implementation manner, the synchronization signal includes indication information, where the indication information is used to indicate the time domain resources and / or frequency domain resources occupied by the second PBCH.

[0054] In combination with the above-mentioned third aspect, in a possible implementation method, the synchronization signal includes a beam index, and the beam index is used by the terminal device to send data and / or signaling to the network device on the beam corresponding to the beam index.

[0055] In a fourth aspect, a communication device is provided for implementing the above method. The communication device includes modules, units, or means corresponding to the above method. The modules, units, or means can be implemented in hardware, software, or by hardware executing corresponding software implementations. The hardware or software includes one or more modules or units corresponding to the above functions.

[0056] In combination with the fourth aspect above, in one possible implementation, the communication device includes: a transceiver module and a synchronization module. In the case where the communication device is a first type of communication device, the transceiver module is used to receive a synchronization signal from a network device, the synchronization signal includes multiple subsequences, the multiple subsequences constitute a long sequence, each subsequence in the multiple subsequences is mapped to a subcarrier of orthogonal frequency division multiplexing (OFDM), and the bandwidth of the synchronization signal is greater than or equal to the bandwidth of any subsequence in the multiple subsequences; the synchronization module is used to perform downlink synchronization according to the synchronization signal; or, in the case where the communication device is a second type of communication device, the transceiver module is used to receive one or more subsequences in the synchronization signal from the network device; the synchronization module is used to perform downlink synchronization according to one or more subsequences in the synchronization signal; wherein the bandwidth of the received signal of the first type of communication device is wider than the bandwidth of the received signal of the second type of communication device.

[0057] In combination with the fourth aspect above, in a possible implementation manner, the number of subsequences included in the synchronization signal is the same as the length of each subsequence included in the synchronization signal.

[0058] In combination with the fourth aspect above, in a possible implementation, the subsequence included in the synchronization signal is a longest linear shift register sequence or a multi-phase sequence.

[0059] In conjunction with the fourth aspect, in one possible implementation, the first subsequence included in the synchronization signal is a multi-phase sequence; and the general term of the first subsequence satisfies the following formula:

[0060] Among them, a, b, c, d, p, q are constants; n=1, 2, ..., N, N represents the length of the first subsequence, and N is a positive integer; k=1, 2, ..., K, K represents the number of subsequences included in the synchronization signal, and K is a positive integer.

[0061] In combination with the fourth aspect above, in a possible implementation, the synchronization signal includes a primary synchronization signal PSS and / or a secondary synchronization signal SSS.

[0062] In combination with the fourth aspect above, in a possible implementation, the number of subsequences included in the PSS is the same as the number of subsequences included in the SSS, and / or the length of each subsequence included in the synchronization signal is the same.

[0063] In combination with the fourth aspect above, in a possible implementation, each subsequence included in the PSS or the SSS occupies the same time domain resources.

[0064] In combination with the fourth aspect above, in a possible implementation, each subsequence included in the PSS occupies the same time domain resources, and each subsequence included in the SSS occupies the same frequency domain resources.

[0065] In combination with the above-mentioned fourth aspect, in a possible implementation, the communication device is a first type of communication device; the transceiver module is further used to receive a first PBCH; wherein the bandwidth occupied by the first PBCH is wider than or equal to the bandwidth occupied by the synchronization signal.

[0066] In combination with the fourth aspect above, in a possible implementation manner, the frequency domain resources occupied by the first PBCH include the frequency domain resources occupied by the synchronization signal.

[0067] In combination with the fourth aspect above, in a possible implementation, the communication device is a second type of communication device; the transceiver module is further used to receive a second PBCH; wherein the bandwidth occupied by the first PBCH is wider than the bandwidth occupied by the second PBCH.

[0068] In combination with the fourth aspect above, in a possible implementation, the frequency domain resources occupied by the synchronization signal include the frequency domain resources occupied by the second PBCH.

[0069] In combination with the fourth aspect above, in a possible implementation manner, the synchronization signal includes indication information, where the indication information is used to indicate the time domain resources and / or frequency domain resources occupied by the second PBCH.

[0070] In combination with the fourth aspect above, in one possible implementation, the synchronization signal includes a beam index, and the beam index is used by the communication device to send data and / or signaling to the network device on the beam corresponding to the beam index.

[0071] In a fifth aspect, a communication device is provided, comprising: a processor; the processor is configured to be coupled to a memory, and after reading computer instructions stored in the memory, execute the method described in the first or second aspect above according to the instructions.

[0072] In combination with the fifth aspect above, in a possible implementation, the communication device further includes a memory; the memory is used to store computer instructions.

[0073] In conjunction with the fifth aspect, in one possible implementation, the communication device further includes a communication interface; the communication interface is used for the communication device to communicate with other devices. Exemplarily, the communication interface can be a transceiver, an input / output interface, an interface circuit, an output circuit, an input circuit, a pin, or related circuits.

[0074] In conjunction with the fifth aspect above, in one possible implementation, the communication device may be a chip or a chip system. When the communication device is a chip system, the communication device may be composed of a chip or may include a chip and other discrete devices.

[0075] In conjunction with the fifth aspect, in one possible implementation, when the communication device is a chip or a chip system, the communication interface may be an input / output interface, an interface circuit, an output circuit, an input circuit, a pin, or related circuits on the chip or chip system. The processor may also be embodied as a processing circuit or a logic circuit.

[0076] In a sixth aspect, a communication system is provided, comprising: a network device that executes the method described in the first aspect above, and a terminal device that executes the method described in the second aspect above.

[0077] In a seventh aspect, a computer-readable storage medium is provided, in which instructions are stored. When the computer-readable storage medium is run on a computer, the computer can execute the method described in the first or second aspect above.

[0078] In an eighth aspect, a computer program product comprising instructions is provided, which, when executed on a computer, enables the computer to execute the method described in any one of the first or second aspects above.

[0079] Among them, the technical effects brought about by any possible implementation method of the second to eighth aspects can be referred to the technical effects brought about by the above-mentioned first aspect or different implementation methods of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] FIG1 is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application;

[0081] FIG2 is a first structural diagram of a communication device provided in an embodiment of the present application;

[0082] FIG3 is a flowchart of a synchronization signal transmission method provided in an embodiment of the present application;

[0083] FIG4 is a flowchart of a method for transmitting a synchronization signal and a PBCH provided in an embodiment of the present application;

[0084] FIG5 is a second flowchart of a method for transmitting a synchronization signal and a PBCH provided in an embodiment of the present application;

[0085] FIG6 is a schematic diagram of a synchronization signal and PBCH provided in an embodiment of the present application;

[0086] FIG7 is a schematic diagram of another synchronization signal and PBCH provided in an embodiment of the present application;

[0087] FIG8 is a second structural diagram of a communication device provided in an embodiment of the present application;

[0088] FIG9 is a third structural diagram of the communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0089] In order to facilitate understanding of the technical solutions of the embodiments of the present application, a brief introduction to the relevant technologies or terms of the present application is first given as follows.

[0090] First, the application scenarios of sequences.

[0091] A sequence can be an ordered set of numbers or elements. In different scenarios, specific sequences can leverage their structure and properties to achieve specific functions. The following describes the application scenarios and functions of sequences.

[0092] In a communication system, a terminal device needs to access the network after powering on. However, the terminal device lacks prior knowledge of the network and cannot properly receive information from network devices. Therefore, the terminal device must first perform a network search and determine information such as timing information and the frequency resources used by the network. To enable the terminal device to obtain this information, the network device periodically sends a synchronization signal carried on a synchronization channel to the terminal device. The synchronization signal can be generated based on a predefined sequence or one of multiple long sequences. Accordingly, the terminal device can search for the synchronization signal at multiple preset frequencies based on the predefined long sequence or any received long sequence. Once the terminal device finds the synchronization signal, it has successfully found the network. The terminal device then performs time synchronization, as well as frequency offset estimation and compensation, to subsequently receive system broadcast information and other signals. It can be seen that the sequence plays a crucial role in the initial synchronization process. Furthermore, the sequence detection performance, as well as its ability to resist frequency offset, interference, and noise, determines whether the terminal device can successfully access the network and the speed at which it can do so. Sequence detection performance can be characterized by sequence correlation.

[0093] Since the above-mentioned synchronization signal is sent by the network device to the terminal device, the above-mentioned synchronization signal can also be called a downlink synchronization signal, and the above-mentioned synchronization process can also be called uplink synchronization. In addition to downlink synchronization, the sequence can also be applied to uplink synchronization. Specifically, after obtaining the information required to access the network, the terminal device can attempt to communicate with the network device to notify the network device of its existence and cooperate with the network device to complete the subsequent access process. Similar to downlink synchronization, the terminal device can send an uplink synchronization signal on a reserved random access resource. The uplink synchronization signal can include an uplink long sequence. Accordingly, the network device will detect the uplink synchronization signal on each reserved random access resource to know whether there is a terminal device requesting to access the network. While detecting the uplink synchronization signal, the network device will also estimate the uplink timing advance parameter and send the estimation result to the terminal device. The terminal device can adjust the timing of its own uplink transmission based on the estimation result, so that the uplink transmission of multiple terminal devices can achieve synchronization at the frame, subframe, time slot or symbol level. It can be seen that the sequence detection performance, as well as the ability to resist frequency offset, interference and noise, also determines the uplink random access request detection performance and the uplink timing advance parameter estimation performance.

[0094] In addition to synchronization, sequences can also be used in multiple access systems. For example, code division multiple access (CDMA) can use sequences as spreading codes, with different terminal devices using different spreading codes. Because spreading codes can be orthogonal, a network device using the spreading code of a particular terminal device during reception can eliminate the influence of information from other terminal devices, thereby successfully receiving information from that specific terminal device. Similarly, in resource reuse and information transmission scenarios, such as pilot multiplexing, sequences can be used as a means of code division. As can be seen, sequence correlation can affect the performance of multiple access systems.

[0095] Sequences can also be used in the design of low peak-to-average power ratio (PAPR) signals. For communication systems that use orthogonal frequency division multiplexing (OFDM) or similar frequency-domain modulation as waveforms, one important factor to consider is the PAPR of the signal, particularly uplink signals, including the PAPR of uplink random access signals and / or uplink pilot signals. In such communication systems, the characteristics of specific sequences can be utilized to design low PAPR signals.

[0096] In future communication systems, such as sixth-generation (6G) mobile communication systems, the integration of communication and perception will be a key new feature. In research on the integration of perception and communication, sequence can influence the implementation and performance of perception functions. Specifically, during wireless transmission, signals experience delays due to transmission distance and frequency offsets, known as Doppler shifts, due to the relative motion between the transmitter and receiver. The target to be detected can transmit a specific sequence known to both the transmitter and receiver. Accordingly, the receiver can detect the delay and Doppler shift of the received specific sequence transmitted through the channel relative to the specific sequence, thereby calculating the distance and velocity information of the target to be detected. To achieve good perception performance, the specific sequence must have good ambiguity function performance. Specifically, the correlation value of the specific sequence has a peak at locations corresponding to the correct delay and / or Doppler shift, and has low sidelobes at locations corresponding to incorrect delay and / or Doppler shifts.

[0097] In addition to the aforementioned application scenarios, sequences are also widely used in communication systems for scrambling, encryption, and codebook generation in precoding. In summary, future research on sequences will focus on achieving superior performance in solving classic problems while also proposing novel sequence designs and expanding into new application scenarios. Because existing systems have numerous and complex definitions of sequences and lack a systematic definition method, there is an urgent need to develop systematic, multi-functional sequence generation methods for future communication systems that are applicable to a wide range of scenarios.

[0098] Second, the existing synchronization signal transmission method.

[0099] In one possible implementation, synchronization signals including the PSS and SSS may be transmitted in the SSB. The narrowband terminal device in the embodiments of the present application may be a device with narrowband reception capabilities, or a device with narrowband transceiver capabilities. The broadband terminal device in the embodiments of the present application may be a device with broadband reception capabilities, or a device with broadband transceiver capabilities. This is described uniformly here and will not be repeated below.

[0100] In LTE networks, the PSS or SSS transmission period can be 5 milliseconds (ms), and the PBCH transmission period can be 10 ms. The PSS includes a long sequence of length 63, and the SSS includes two long sequences of length 31. The PBCH can occupy 6 resource blocks (RBs).

[0101] In an NR network, the period of SSB transmission for initial access can be 20ms. The long sequence included in the PSS can be a maximum linear shift register sequence of length 127, and the long sequence included in the SSS can be a Gold sequence of length 127. The maximum linear shift register sequence (maximal length linear shift register sequence) can also be called an m-sequence. The PSS and SSS can each occupy 12 RBs, and the PBCH can occupy 20 RBs. In an NR network, the SSB can include the PSS, SSS, and PBCH.

[0102] In LTE or NR networks, the PSS or SSS sent by the base station to the UE includes a long sequence. In order to properly receive the synchronization signal, the minimum bandwidth of the terminal device to be connected must meet the bandwidth requirements of the synchronization signal. That is, the bandwidth of the terminal device to be connected must be greater than or equal to the bandwidth of the synchronization signal. Therefore, the above design is only applicable to broadband terminal devices.

[0103] If the above design is applied to narrowband terminal devices, they will not be able to properly receive the synchronization signals intended for broadband terminal devices. Therefore, in existing synchronization signal transmission methods, additional synchronization signals are designed specifically for narrowband terminal devices. This increases the complexity of signal design on the network device side and results in a waste of time and frequency resources.

[0104] Terminal devices with different capabilities accessing the same network is likely a future wireless communication scenario. For example, narrowband and broadband terminal devices may need to access the network simultaneously. To simplify this scenario, it is necessary to design a synchronization signal that can be used by both broadband and narrowband terminal devices. In the embodiments of the present application, the network device does not distinguish between terminal device types and uniformly sends a synchronization signal consisting of multiple subsequences. Accordingly, terminal devices can adopt different reception methods based on their own types.

[0105] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Among them, in the description of the present application, unless otherwise specified, " / " indicates that the objects associated before and after are in an "or" relationship, for example, A / B can represent A or B; "and / or" in the present application is only a description of the associated relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In addition, in the description of the present application, unless otherwise specified, "multiple" refers to two or more than two. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple. In addition, in order to facilitate the clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, words such as "first" and "second" are used to distinguish between identical or similar items with substantially the same functions and effects. Those skilled in the art will understand that words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit differences. At the same time, in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or design schemes. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a concrete way for easy understanding.

[0106] The architectural diagram of a mobile communication system shown in FIG1 is a schematic diagram of the architecture of a communication system 1000 used in an embodiment of the present application. As shown in FIG1 , the communication system includes a radio access network 100 and a core network 200. Optionally, the communication system 1000 may also include the Internet 300. The radio access network 100 may include at least one radio access network device (such as 110a and 110b in FIG1 ) and at least one terminal device (such as 120a-120j in FIG1 ). The terminal device is wirelessly connected to the radio access network device, and the radio access network device is wirelessly or wiredly connected to the core network. The core network device and the radio access network device may be independent and distinct physical devices, or the functions of the core network device and the logical functions of the radio access network device may be integrated into the same physical device, or a single physical device may integrate some of the functions of the core network device and some of the functions of the radio access network device. Terminal devices and radio access network devices may be connected to each other via wired or wireless connections. FIG1 is only a schematic diagram. The communication system may further include other network devices, such as wireless relay devices and wireless backhaul devices, which are not shown in FIG1 .

[0107] Radio access network equipment is the access device that terminal devices use to access the communication system wirelessly. Radio access network equipment can be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next-generation NodeB (gNB) in a fifth-generation (5G) mobile communication system, a next-generation base station in a 6G mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system. In another possible scenario, multiple radio access network (RAN) nodes collaborate to assist the terminal in achieving wireless access, with different RAN nodes implementing part of the base station's functions. For example, a RAN node can be a centralized unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU). The CU and DU can be set up separately, or they can be included in the same network element, such as the baseband unit (BBU). The RU may be included in a radio frequency device or a radio frequency unit, for example, in a remote radio unit (RRU), an active antenna unit (AAU) or a remote radio head (RRH).

[0108] In different systems, CU (or CU-CP and CU-UP), DU or RU may also have different names, but those skilled in the art can understand their meanings. For example, in an open RAN (ORAN) system, CU may also be called O-CU (open CU), DU may also be called O-DU, CU-CP may also be called O-CU-CP, CU-UP may also be called O-CU-UP, and RU may also be called O-RU. For the convenience of description, this application uses CU, CU-CP, CU-UP, DU and RU as examples for description. Any unit of CU (or CU-CP, CU-UP), DU and RU in this application may be implemented by a software module, a hardware module, or a combination of a software module and a hardware module. The embodiments of the present application may be implemented by a DU or a RU.

[0109] The wireless access network device can be a macro base station (such as 110a in Figure 1), a micro base station or an indoor station (such as 110b in Figure 1), a relay node, a donor node, etc. The embodiments of this application do not limit the specific technology and device form used by the wireless access network device. For ease of description, the following description uses a base station as an example of a wireless access network device.

[0110] A terminal device is a device with wireless transceiver capabilities that can send signals to a base station or receive signals from a base station. A terminal device may also be referred to as a terminal, user equipment (UE), mobile station, mobile terminal device, etc. Terminal devices can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IoT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearable, smart transportation, smart city, etc. A terminal device may be a mobile phone, tablet computer, computer with wireless transceiver capabilities, wearable device, vehicle, drone, helicopter, airplane, ship, robot, robotic arm, smart home device, etc. The embodiments of this application do not limit the specific technology and specific device form adopted by the terminal device.

[0111] Base stations and terminal devices can be fixed or mobile. They can be deployed on land, indoors or outdoors, handheld or vehicle-mounted; on water; or on aircraft, balloons, and satellites. The embodiments of this application do not limit the application scenarios of base stations and terminal devices.

[0112] The roles of base stations and terminal devices can be relative. For example, the helicopter or drone 120i in Figure 1 can be configured as a mobile base station. For terminal devices 120j accessing the wireless access network 100 via 120i, terminal device 120i is a base station. However, for base station 110a, 120i is a terminal device, meaning that communication between 110a and 120i occurs via a wireless air interface protocol. Of course, communication between 110a and 120i can also occur via a base station-to-base station interface protocol. In this case, 120i is also a base station relative to 110a. Therefore, base stations and terminal devices can be collectively referred to as communication devices. 110a and 110b in Figure 1 can be referred to as communication devices with base station functionality, and 120a-120j in Figure 1 can be referred to as communication devices with terminal functionality.

[0113] Communication between base stations and terminal devices, between base stations, and between terminal devices can be carried out through authorized spectrum, unauthorized spectrum, or both; communication can be carried out through spectrum below 6 gigahertz (GHz), spectrum above 6 GHz, or spectrum below 6 GHz and spectrum above 6 GHz. The embodiments of the present application do not limit the spectrum resources used for wireless communication.

[0114] Functions such as synchronization, channel estimation, and perception can be achieved between the base station and the terminal device through sequences. In the embodiment of the present application, the synchronization signal sent by the base station to the terminal device may include a long sequence. Accordingly, the terminal device can receive the synchronization signal from the base station according to its own type to achieve downlink synchronization. Synchronization can be understood as the process of establishing time synchronization and / or frequency synchronization between the base station and the terminal device. Specifically, the transmitter can send a specific sequence, i.e., a long sequence. The receiver can detect this specific sequence. Afterwards, the receiver can adjust its own timing according to the time of the detected specific sequence, and / or the receiver can adjust its own carrier frequency according to the frequency of the detected specific sequence. Alternatively, the receiver can then notify the transmitter to adjust the timing and / or carrier frequency. For the downlink, the transmitter can be the base station and the receiver can be the terminal device. For the uplink, the transmitter can be the terminal device and the receiver can be the base station.

[0115] In the embodiments of the present application, the functions of the base station may also be performed by a module (such as a chip) in the base station, or by a control subsystem that includes the base station functions. The control subsystem that includes the base station functions here may be a control center in the above-mentioned application scenarios such as smart grid, industrial control, smart transportation, and smart city. The functions of the terminal device may also be performed by a module (such as a chip or a modem) in the terminal device, or by a device that includes the terminal device functions.

[0116] In this application, a base station sends downlink signals or downlink information to a terminal device, and the downlink information is carried on a downlink channel; the terminal device sends uplink signals or uplink information to the base station, and the uplink information is carried on an uplink channel. In order to communicate with the base station, the terminal device needs to establish a wireless connection with the cell controlled by the base station. The cell with which the terminal device has established a wireless connection is called the serving cell of the terminal device. When the terminal device communicates with the serving cell, it will also be interfered with by signals from neighboring cells.

[0117] Exemplarily, the network device 110 provided in the embodiment of the present application may be 110a or 110b in FIG. 1 , and the terminal device 120 provided in the embodiment of the present application may be any one of 120a - 120j in FIG. 1 .

[0118] Optionally, the relevant functions of the terminal device or network device in the embodiments of the present application can be implemented by a single device, or by multiple devices, or by one or more functional modules within a single device, and the embodiments of the present application do not specifically limit this. It is understood that the above functions can be network elements in hardware devices, software functions running on dedicated hardware, a combination of hardware and software, or virtualized functions instantiated on a platform (e.g., a cloud platform).

[0119] For example, the relevant functions of the terminal device or network device in the embodiment of the present application can be implemented by the communication device 20 in Figure 2.

[0120] Figure 2 is a schematic diagram of the structure of a communication device 20 provided in an embodiment of the present application. The communication device 20 includes one or more processors 201, a communication circuit 202, and at least one communication interface (Figure 2 is merely an example of a communication interface 204 and a processor 201), and may optionally include a memory 203.

[0121] The processor 201 may be a CPU, a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the present application.

[0122] The communication line 202 may include pathways for connecting different components.

[0123] Communication interface 204 can be a transceiver module for communicating with other devices or communication networks, such as Ethernet, RAN, WLAN, etc. For example, the transceiver module can be a device such as a transceiver or a transceiver. Alternatively, communication interface 204 can be a transceiver circuit located within processor 201, used to implement signal input and output to the processor.

[0124] The memory 203 may be a device having a storage function. For example, it may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory may exist independently and be connected to the processor via the communication line 202. The memory may also be integrated with the processor.

[0125] The memory 203 is used to store computer-executable instructions for executing the solution of the present application, and the execution is controlled by the processor 201. The processor 201 is used to execute the computer-executable instructions stored in the memory 203, thereby implementing the synchronization signal transmission method provided in the embodiment of the present application.

[0126] Alternatively, in an embodiment of the present application, the processor 201 may also perform processing-related functions in the synchronization signal transmission method provided in the following embodiments of the present application, and the communication interface 204 is responsible for communicating with other devices or communication networks, which is not specifically limited in the embodiments of the present application.

[0127] The computer-executable instructions in the embodiments of the present application may also be referred to as application code, which is not specifically limited in the embodiments of the present application.

[0128] In a specific implementation, as an embodiment, the processor 201 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 2 .

[0129] In a specific implementation, as an embodiment, the communication device 20 may include multiple processors, such as processor 201 and processor 207 in Figure 2. Each of these processors may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. The processor here may refer to one or more devices, circuits, and / or processing cores for processing data (e.g., computer program instructions).

[0130] In a specific implementation, as an embodiment, the communication apparatus 20 may further include an output device 205 and an input device 206. The output device 205 communicates with the processor 201 and may display information in a variety of ways.

[0131] The communication device 20 can be a general-purpose device or a dedicated device. For example, the communication device 20 can be a desktop computer, a portable computer, a network server, a personal digital assistant (PDA), a mobile phone, a tablet computer, a wireless terminal device, an in-vehicle terminal device, an embedded device, or a device having a similar structure to that shown in FIG2 . The embodiments of the present application do not limit the type of the communication device 20.

[0132] The following will describe in detail the synchronization signal transmission method provided in the embodiment of the present application with reference to FIG1 and FIG2 .

[0133] As shown in FIG3 , a synchronization signal transmission method provided in an embodiment of the present application includes the following steps:

[0134] Step S301: A network device determines a synchronization signal including multiple subsequences.

[0135] In the embodiment of the present application, determining a signal can be understood as generating a signal, or obtaining a predefined signal. The embodiment of the present application does not impose any limitation on the determination method.

[0136] The bandwidth of the synchronization signal is greater than or equal to the bandwidth of any subsequence in the multiple subsequences.

[0137] The multiple subsequences in the embodiment of the present application can constitute a complete sequence, that is, a long sequence included in the synchronization signal in the existing synchronization signal transmission method. In the embodiment of the present application, each subsequence can be mapped to multiple subcarriers of OFDM in the frequency domain.

[0138] In an embodiment of the present application, the number of subsequences included in the synchronization signal is greater than or equal to 2.

[0139] Optionally, the number of subsequences included in the synchronization signal is the same as the length of each subsequence included in the synchronization signal. In this solution, the long sequence can be equally divided into K subsequences, that is, the number of subsequences included in the synchronization signal can be represented as K. The length of the subsequence can be represented as N. For example, K = N = 11. Simulation results show that in this solution, the subsequences have good ambiguity function performance. Specifically, the correlation value of the sequence has lower sidelobes corresponding to erroneous delay and / or Doppler frequency offset.

[0140] In the embodiment of the present application, the values ​​of K and N may also be different. In addition, the lengths of the multiple subsequences included in the synchronization signal may also be different, that is, the long sequence may be divided into K subsequences, and the lengths of at least two subsequences in the K subsequences are different. This embodiment of the present application does not impose any limitation on this.

[0141] Optionally, the subsequence included in the synchronization signal is a longest linear shift register sequence or a multi-phase sequence.

[0142] Optionally, the first subsequence included in the synchronization signal is a multi-phase sequence; the general term of the first subsequence satisfies the following formula (1):

[0143] Where a, b, c, d, p, and q are constants; n = 1, 2, ..., N, where N represents the length of the first subsequence and is a positive integer; k = 1, 2, ..., K, where K represents the number of subsequences included in the synchronization signal and is a positive integer. In particular, if p = 3 and q = 2, then the above formula (1) can be expressed as formula (2):

[0144] The synchronization signal in the embodiment of the present application includes PSS and / or SSS.

[0145] Optionally, the number of subsequences included in the PSS is the same as the number of subsequences included in the SSS, and / or the length of each subsequence included in the synchronization signal is the same. In this scheme, the PSS and the SSS can have the same sequence structure design, that is, the same number and / or length of subsequences. This will enable the terminal device, especially the second type of terminal device, to receive the performance of PSS and SSS equivalent. In other words, the way of dividing the subsequences is the same for PSS and SSS. When the number of subsequences included in the PSS is the same as the number of subsequences included in the SSS, the long sequence can also be divided into multiple subsequences in unequal amounts.

[0146] In a possible implementation, the PSS and the SSS may have the same number and length of subsequences, and the general term of each subsequence may satisfy the above formula (1) or formula (2).

[0147] Optionally, each subsequence included in the PSS or SSS occupies the same time domain resources. In this solution, the multiple subsequences included in the PSS or SSS can be mapped to multiple consecutive subcarriers of OFDM. Since the long sequence included in the synchronization signal in the existing synchronization signal transmission method is mapped to multiple consecutive subcarriers of OFDM, this solution can increase compatibility with the existing synchronization signal transmission method.

[0148] In the embodiment of the present application, the PSS and SSS may also have different sequence structure designs. In other words, the subsequences of the PSS and SSS are divided in different ways. The embodiment of the present application does not impose any limitation on this.

[0149] In a possible implementation, the PSS and SSS may have different sequence structure designs, but the general term of each subsequence may satisfy the above formula (1) or formula (2).

[0150] Optionally, each subsequence included in the PSS occupies the same time domain resources, and each subsequence included in the SSS occupies the same frequency domain resources. In this scheme, the multiple subsequences included in the PSS can be mapped to multiple consecutive subcarriers of OFDM. The multiple subsequences included in the SSS can be mapped to multiple consecutive OFDM symbols, and each subsequence included in the SSS can be mapped to multiple consecutive subcarriers of OFDM. For terminal devices, especially the second type of terminal devices, the SSS may not be limited by bandwidth, so that the SSS can include more subsequences, or the SSS can carry more information.

[0151] Step S302: The network device sends a synchronization signal to the terminal device.

[0152] When the terminal device is a first type of terminal device, the following step S303 is performed:

[0153] Step S303: The terminal device receives a synchronization signal from the network device and performs downlink synchronization according to the synchronization signal.

[0154] Alternatively, when the terminal device is a second type of terminal device, the following step S304 is performed:

[0155] Step S304: The terminal device receives one or more subsequences in the synchronization signal from the network device, and performs downlink synchronization according to the one or more subsequences in the synchronization signal.

[0156] Exemplarily, the second type of terminal device in the embodiment of the present application may be a NB-IoT terminal device.

[0157] In the synchronization signal transmission method provided in the embodiments of the present application, the synchronization signal can include multiple subsequences, so that a broadband terminal device can receive the synchronization signal including all subsequences, and a narrowband terminal device can receive one or more subsequences within the synchronization signal. The embodiments of the present application can employ the same synchronization signal transmission structure for both broadband and narrowband terminal devices, thereby reducing the complexity of cellular network system design and achieving the technical effect of conserving time and frequency resources.

[0158] Optionally, the synchronization signal transmission method provided in an embodiment of the present application further includes: a network device sending a first PBCH to a terminal device. The bandwidth occupied by the first PBCH is wider than or equal to the bandwidth occupied by the synchronization signal. In this solution, separate PBCHs can be designed for two different types of terminal devices. Because the first PBCH occupies more frequency domain resources, it is suitable for broadband terminal devices. The first PBCH in the embodiment of the present application may also be referred to as a broadband PBCH.

[0159] Optionally, the synchronization signal transmission method provided in an embodiment of the present application further includes: the network device sending a second PBCH to the terminal device. The bandwidth occupied by the first PBCH is wider than the bandwidth occupied by the second PBCH. In this solution, separate PBCHs can be designed for two different types of terminal devices. Because the second PBCH occupies fewer frequency domain resources, it is suitable for narrowband terminal devices. The second PBCH in the embodiment of the present application may also be referred to as a narrowband PBCH.

[0160] It should be noted that the network device needs to determine the first PBCH before sending the first PBCH to the terminal device. The network device needs to determine the second PBCH before sending the second PBCH to the terminal device.

[0161] In the embodiment of the present application, determining the PBCH can be understood as generating the PBCH, or obtaining a predefined PBCH. The embodiment of the present application does not impose any limitation on the determination method.

[0162] Optionally, the frequency domain resources occupied by the first PBCH include frequency domain resources occupied by a synchronization signal.

[0163] Optionally, the frequency domain resources occupied by the synchronization signal include frequency domain resources occupied by the second PBCH.

[0164] When the terminal device is a terminal device of the first type, the terminal device receives a first PBCH from the network device. Optionally, the terminal device may also receive a second PBCH from the network device.

[0165] Alternatively, when the terminal device is a second type of terminal device, the terminal device receives a second PBCH from the network device.

[0166] Exemplarily, the first type of terminal device in the embodiment of the present application may be a broadband terminal device, and the second type of terminal device in the embodiment of the present application may be a narrowband terminal device.

[0167] In combination with the above description of the synchronization signal and the first PBCH, in one possible implementation, FIG4 shows a flowchart of a method for transmitting a synchronization signal and a PBCH provided in an embodiment of the present application, including the following steps:

[0168] Step S401: A network device determines a synchronization signal including multiple subsequences.

[0169] The relevant description of step S401 can refer to the above step S301 and will not be repeated here.

[0170] Step S402: The network device sends a synchronization signal and a first PBCH to the terminal device. Accordingly, when the terminal device is a terminal device of the first type, the terminal device receives the synchronization signal and the first PBCH from the network device.

[0171] Specifically, the terminal device can receive the system information included in the first PBCH to facilitate subsequent signal processing.

[0172] Step S403: The terminal device performs downlink synchronization according to the synchronization signal.

[0173] Optionally, the network device may send a second PBCH to the terminal device. In the case where the terminal device is a first type of terminal device, the terminal device may receive and parse the second PBCH, or the terminal device may not receive the second PBCH, which is not limited in this application.

[0174] In combination with the above description of the synchronization signal and the second PBCH, in another possible implementation, FIG5 shows a flowchart of another method for transmitting a synchronization signal and a PBCH provided in an embodiment of the present application, including the following steps:

[0175] Step S501: A network device determines a synchronization signal including multiple subsequences.

[0176] The relevant description of step S501 can refer to the above step S301 and will not be repeated here.

[0177] Step S502: The network device sends a synchronization signal to the terminal device.

[0178] Optionally, the network device may further send the first PBCH to the terminal device. In the case that the terminal device is a second type of terminal device, since the bandwidth of the first PBCH usually exceeds the receiving bandwidth of the terminal device, the terminal device may not receive the first PBCH.

[0179] Step S503: When the terminal device is a second type of terminal device, the terminal device receives one or more subsequences in a synchronization signal from the network device.

[0180] Step S504: When the terminal device is a terminal device of the second type, the terminal device performs downlink synchronization according to one or more subsequences in the synchronization signal.

[0181] Step S505: The network device sends a second PBCH to the terminal device. Accordingly, when the terminal device is a terminal device of the second type, the terminal device receives the second PBCH from the network device.

[0182] Specifically, the terminal device can receive the system information included in the second PBCH to facilitate subsequent signal processing.

[0183] Optionally, step S504 may be performed first and then step S505, or step S505 may be performed first and then step S504, or step S504 and step S505 may be performed simultaneously. This embodiment of the present application does not impose any limitation on this.

[0184] Optionally, the synchronization signal includes indication information, and the indication information is used to indicate the time domain resources and / or frequency domain resources occupied by the second PBCH. In this solution, the synchronization signal may include indication information for indicating scheduling information of the second PBCH. In an embodiment of the present application, the time-frequency resource location of the second PBCH may be flexible, and the synchronization signal may carry more information. Specifically, the time-frequency resource location occupied by the second PBCH may have multiple candidate locations, and the specific location may be indicated by the synchronization signal.

[0185] Optionally, the synchronization signal includes a beam index, which is used by the terminal device to send data and / or signaling to the network device on the beam corresponding to the beam index. This solution can be applied to non-initial access by the terminal device, for example, when the terminal device requests access to the network device again after terminating sleep. In this case, the terminal device does not need to receive the PBCH and can directly send data and / or signaling to the network device on the beam corresponding to the beam index, thereby achieving the technical effect of energy saving.

[0186] Taking the example of the same sequence structure design for PSS and SSS, Figure 6 shows a schematic diagram of a synchronization signal and PBCH, where 1, 2, ..., K represents the subsequence number. In Figure 6, the long sequences included in PSS and SSS can be equally divided into K subsequences, respectively. Assume that for PSS and SSS, K = N = 11, where N represents the length of each subsequence. The 11 subsequences included in PSS or SSS can be mapped to multiple consecutive subcarriers of OFDM. Alternatively, assume that for PSS and SSS, K = 3, N = 31; or, assume that for PSS and SSS, K = 3, N = 41; or, assume that for PSS and SSS, K = 3, N = 43.

[0187] The frequency domain range occupied by the wideband PBCH is larger than the frequency domain range occupied by the PSS or SSS. Conversely, the frequency domain range occupied by the narrowband PBCH is smaller than the frequency domain range occupied by the PSS or SSS. The first time interval may be the difference between the minimum value within the time domain range occupied by the wideband PBCH and the maximum value within the time domain range occupied by the PSS. The second time interval may be the difference between the minimum value within the time domain range occupied by the narrowband PBCH and the maximum value within the time domain range occupied by the wideband PBCH.

[0188] Network devices can transmit the PSS, SSS, wideband PBCH, and narrowband PBCH. Wideband terminal devices can receive the wideband PBCH, all PSS subsequences, and all SSS subsequences. Narrowband terminal devices can receive the narrowband PBCH, as well as portions of the PSS and SSS, i.e., one or M subsequences of the PSS and SSS, where M is a positive integer less than 11.

[0189] As an example, Figure 6 only shows the case where multiple PSS or SSS subsequences are continuous in the frequency domain. In practice, multiple PSS or SSS subsequences may also be spaced apart in the frequency domain, and this embodiment of the present application does not impose any limitation on this.

[0190] As an example, Figure 6 only shows the case where the frequency domain resources occupied by the wideband PBCH include the frequency domain resources occupied by the PSS or SSS. In practice, the bandwidth occupied by the wideband PBCH is wider than or equal to the bandwidth occupied by the PSS or SSS. The embodiment of the present application does not impose any limitation on the frequency position relationship between the wideband PBCH and the synchronization signal. Similarly, Figure 6 only shows the case where the frequency domain resources occupied by the PSS or SSS include the frequency domain resources occupied by the second PBCH. In practice, the bandwidth occupied by the PSS or SSS is wider than or equal to the bandwidth occupied by the narrowband PBCH. The embodiment of the present application does not impose any limitation on the frequency position relationship between the synchronization signal and the narrowband PBCH.

[0191] Taking the example of PSS and SSS having different sequence structure designs, Figure 7 shows a schematic diagram of another synchronization signal and PBCH, where 1, 2, ..., K represent the subsequence numbers. In Figure 7, it is assumed that for PSS, K = N = 11, which is exactly the same as the sequence structure design of PSS in Figure 6; or, K = 3, N = 31, 41, or 43. For SSS, K = 3, N = 31, 41, or 43. The PSS includes 11 subsequences that can be mapped to multiple consecutive subcarriers of OFDM. The 3 subsequences included in the SSS can be mapped to multiple consecutive OFDM symbols, and each subsequence included in the SSS can be mapped to multiple consecutive subcarriers of OFDM. The frequency domain range occupied by the wideband PBCH is larger than the frequency domain range occupied by the PSS or SSS. Conversely, the frequency domain range occupied by the narrowband PBCH is smaller than the frequency domain range occupied by the PSS or SSS. The first time interval can be the difference between the minimum value in the time domain range occupied by the wideband PBCH and the maximum value in the time domain range occupied by the PSS. The SSS may include indication information for indicating scheduling information of the narrowband PBCH.

[0192] Network devices can transmit the PSS, SSS, wideband PBCH, and narrowband PBCH. Wideband terminal devices can receive the wideband PBCH, all SSS subsequences, and all PSS subsequences. Narrowband terminal devices can receive the narrowband PBCH, SSS, and part of the PSS, i.e., one or M subsequences of the PSS, where M is a positive integer less than 11.

[0193] As an example, FIG7 only illustrates a case where multiple PSS subsequences are continuous in the frequency domain and multiple SSS subsequences are continuous in the time domain. In practice, multiple PSS subsequences may be spaced apart in the frequency domain, and / or multiple SSS subsequences may be spaced apart in the time domain, and this embodiment of the present application does not impose any limitation on this.

[0194] It can be understood that in the above embodiments, the methods and / or steps implemented by the network device can also be implemented by components (such as chips or circuits) that can be used for the network device or an apparatus including the network device; the methods and / or steps implemented by the terminal device can also be implemented by components (such as chips or circuits) that can be used for the terminal device or an apparatus including the terminal device.

[0195] It is understandable that, in order to implement the above functions, the network device or terminal device includes a hardware structure and / or software module that performs the corresponding functions. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in a hardware or computer software driven hardware manner depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0196] In the embodiment of the present application, the network device or terminal device can be divided into functional modules according to the above method embodiment. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical functional division. In actual implementation, there may be other division methods.

[0197] For example, the network device in the embodiment of the present application can be implemented in the form of a communication device 800 shown in Figure 8. The communication device 800 may include a synchronization signal determination module 801 and a transceiver module 802. The communication device 800 is used to implement the functions of the terminal device in the method embodiments shown in Figures 3 to 7 above.

[0198] Exemplarily, when the communication device 800 is used to implement the functions of the network device in the method embodiment shown in Figure 3: the synchronization signal determination module 801 is used to determine a synchronization signal including multiple subsequences; the transceiver module 802 is used to send a synchronization signal to the terminal device.

[0199] For a more detailed description of the synchronization signal determination module 801 and the transceiver module 802 , reference may be made to the relevant descriptions in the method embodiments shown in FIG. 3 to FIG. 7 .

[0200] For another example, the terminal device in the embodiment of the present application can be implemented in the form of a communication device 900 shown in Figure 9. The communication device 900 may include a transceiver module 901 and a synchronization module 902. The communication device 900 is used to implement the functions of the terminal device in the method embodiments shown in Figures 3 to 7 above.

[0201] Exemplarily, when the terminal device is a first type of terminal device, the transceiver module 901 is used to receive a synchronization signal; the synchronization module 902 is used to perform downlink synchronization according to the synchronization signal; or, when the terminal device is a second type of terminal device, the transceiver module 901 is used to receive one or more subsequences in the synchronization signal; the synchronization module 902 is used to perform downlink synchronization according to one or more subsequences in the synchronization signal.

[0202] For a more detailed description of the above-mentioned transceiver module 901 and synchronization module 902, reference may be made to the relevant descriptions in the method embodiments shown in FIG. 3 to FIG. 7 .

[0203] In this embodiment, the communication device 800 or the communication device 900 is presented in the form of various functional modules divided in an integrated manner. The "module" here can refer to a specific ASIC, circuit, processor and memory that executes one or more software or firmware programs, integrated logic circuit, and / or other devices that can provide the above functions.

[0204] In a simple embodiment, those skilled in the art may appreciate that the communication device 900 may take the form of the communication device 20 shown in FIG. 2 .

[0205] For example, the processor 201 and / or the processor 207 in the communication device 20 shown in FIG2 can call the computer-executable instructions stored in the memory 203 to enable the communication device 20 to execute the synchronization signal transmission method in the above-mentioned method embodiment. Specifically, part of the functions / implementation process of the synchronization signal determination module 801 in FIG8 can be implemented by the processor 201 and / or the processor 207 in the communication device 20 shown in FIG2 calling the computer-executable instructions stored in the memory 203; part of the functions / implementation process of the transceiver module 802 in FIG8 can be implemented by a communication module connected via the communication interface 204 in FIG2.

[0206] In a simple embodiment, those skilled in the art may appreciate that the communication device 900 may take the form of the communication device 20 shown in FIG. 2 .

[0207] For example, the processor 201 and / or the processor 207 in the communication device 20 shown in FIG2 can call the computer-executable instructions stored in the memory 203 to enable the communication device 20 to execute the synchronization signal transmission method in the above-mentioned method embodiment. Specifically, part of the functions / implementation process of the transceiver module 901 in FIG9 can be implemented by a communication module connected via the communication interface 204 in FIG2. Part of the functions / implementation process of the synchronization module 902 in FIG9 can be implemented by the processor 201 and / or the processor 207 in the communication device 20 shown in FIG2 calling the computer-executable instructions stored in the memory 203.

[0208] Since the communication device 800 and the communication device 900 provided in this embodiment can execute the above-mentioned method for transmitting a synchronization signal, the technical effects that can be obtained can refer to the above-mentioned method embodiments and will not be repeated here.

[0209] It should be noted that one or more of the above modules or units can be implemented by software, hardware, or a combination of the two. When any of the above modules or units is implemented by software, the software exists in the form of computer program instructions and is stored in a memory, and a processor can be used to execute the program instructions and implement the above method flow. The processor can be built into an SoC (system on chip) or an ASIC, or it can be an independent semiconductor chip. In addition to the core used to execute software instructions to perform calculations or processing within the processor, it can further include necessary hardware accelerators, such as a field programmable gate array (FPGA), a PLD (programmable logic device), or a logic circuit that implements dedicated logic operations.

[0210] When the above modules or units are implemented in hardware, the hardware can be any one or any combination of a CPU, a microprocessor, a digital signal processing (DSP) chip, a microcontroller unit (MCU), an artificial intelligence processor, an ASIC, a SoC, an FPGA, a PLD, a dedicated digital circuit, a hardware accelerator or a non-integrated discrete device, which can run the necessary software or not rely on the software to execute the above method flow.

[0211] Optionally, an embodiment of the present application further provides a chip system, comprising: at least one processor and an interface, wherein the at least one processor is coupled to a memory via the interface, and when the at least one processor executes a computer program or instruction in the memory, the method in any of the above method embodiments is executed. In one possible implementation, the communication device also includes a memory. Optionally, the chip system can be composed of a chip, or can include a chip and other discrete devices, which is not specifically limited in the embodiment of the present application.

[0212] In the above embodiments, all or part of the embodiments may be implemented by software, hardware, firmware, or any combination thereof. When implemented using a software program, all or part of the embodiments may be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a solid state disk (SSD)).

[0213] Although the present application is described herein in conjunction with various embodiments, in the process of implementing the claimed application, those skilled in the art can understand and implement other changes to the disclosed embodiments by reviewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude multiple situations. A single processor or other unit can implement several functions listed in the claims. Certain measures are recorded in different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

[0214] Although the present application has been described with reference to specific features and embodiments thereof, it is apparent that various modifications and combinations may be made thereto without departing from the spirit and scope of the present application. Accordingly, this specification and the drawings are merely illustrative of the present application as defined by the appended claims and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art may make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, the present application is intended to include such modifications and variations as fall within the scope of the claims of the present application and their equivalents.

Claims

1. A method for transmitting a synchronization signal, characterized in that: include: Determine a synchronization signal including a plurality of subsequences, each of the plurality of subsequences being mapped to a subcarrier of orthogonal frequency division multiplexing (OFDM), and a bandwidth of the synchronization signal being greater than or equal to a bandwidth of any subsequence of the plurality of subsequences; The synchronization signal is sent to the terminal device, and the synchronization signal is used by the terminal device to perform downlink synchronization.

2. The method according to claim 1, characterized in that The number of subsequences included in the synchronization signal is the same as the length of each subsequence included in the synchronization signal.

3. The method according to claim 1 or 2, characterized in that: The subsequence included in the synchronization signal is a longest linear shift register sequence or a multi-phase sequence.

4. The method according to claim 1 or 2, characterized in that: The first subsequence included in the synchronization signal is a multi-phase sequence; the general term of the first subsequence satisfies the following formula: Among them, a, b, c, d, p, q are constants; n=1, 2, ..., N, N represents the length of the first subsequence, and N is a positive integer; k=1, 2, ..., K, K represents the number of subsequences included in the synchronization signal, and K is a positive integer.

5. The method according to any one of claims 1 to 4, characterized in that: The synchronization signal includes a primary synchronization signal PSS and / or a secondary synchronization signal SSS.

6. The method according to claim 5, characterized in that The number of subsequences included in the PSS is the same as the number of subsequences included in the SSS, and / or the length of each subsequence included in the synchronization signal is the same.

7. The method according to claim 5 or 6, characterized in that: Each subsequence included in the PSS or the SSS occupies the same time domain resources.

8. The method according to claim 5 or 6, characterized in that: Each subsequence included in the PSS occupies the same time domain resources, and each subsequence included in the SSS occupies the same frequency domain resources.

9. The method according to any one of claims 1 to 8, characterized in that: The method further comprises: A first physical broadcast channel PBCH is sent; wherein a bandwidth occupied by the first PBCH is wider than or equal to a bandwidth occupied by the synchronization signal.

10. The method according to claim 9, characterized in that The frequency domain resources occupied by the first PBCH include the frequency domain resources occupied by the synchronization signal.

11. The method according to any one of claims 1 to 10, characterized in that: The method further comprises: Sending a second PBCH; wherein a bandwidth occupied by the first PBCH is wider than a bandwidth occupied by the second PBCH.

12. The method according to claim 11, characterized in that The frequency domain resources occupied by the synchronization signal include the frequency domain resources occupied by the second PBCH.

13. The method according to claim 11 or 12, characterized in that: The synchronization signal includes indication information, and the indication information is used to indicate the time domain resources and / or frequency domain resources occupied by the second PBCH.

14. The method according to any one of claims 1 to 13, characterized in that: The synchronization signal includes a beam index, and the beam index is used by the terminal device to send data and / or signaling on the beam corresponding to the beam index.

15. A method for transmitting a synchronization signal, characterized in that: Applied to terminal equipment, including: In the case where the terminal device is a terminal device of the first type, receiving a synchronization signal, the synchronization signal comprising a plurality of subsequences, each of the plurality of subsequences being mapped to a subcarrier of orthogonal frequency division multiplexing OFDM, and a bandwidth of the synchronization signal being greater than or equal to a bandwidth of any subsequence of the plurality of subsequences; performing downlink synchronization according to the synchronization signal; or, In the case where the terminal device is a terminal device of the second type, receiving one or more subsequences in the synchronization signal; performing downlink synchronization according to the one or more subsequences in the synchronization signal; The bandwidth of the signal received by the first type of terminal device is wider than the bandwidth of the signal received by the second type of terminal device.

16. The method according to claim 15, characterized in that The number of subsequences included in the synchronization signal is the same as the length of each subsequence included in the synchronization signal.

17. The method according to claim 15 or 16, characterized in that The subsequence included in the synchronization signal is the longest linear shift register sequence or the multi-phase sequence.

18. The method according to claim 15 or 16, characterized in that The first subsequence included in the synchronization signal is a multi-phase sequence; the general term of the first subsequence satisfies the following formula: Among them, a, b, c, d, p, q are constants; n=1, 2, ..., N, N represents the length of the first subsequence, and N is a positive integer; k=1, 2, ..., K, K represents the number of subsequences included in the synchronization signal, and K is a positive integer.

19. The method according to any one of claims 15 to 18, characterized in that: The synchronization signal includes a primary synchronization signal PSS and / or a secondary synchronization signal SSS.

20. The method according to claim 19, characterized in that The number of subsequences included in the PSS is the same as the number of subsequences included in the SSS, and / or the length of each subsequence included in the synchronization signal is the same.

21. The method according to claim 19 or 20, characterized in that Each subsequence included in the PSS or the SSS occupies the same time domain resources.

22. The method according to claim 19 or 20, characterized in that Each subsequence included in the PSS occupies the same time domain resources, and each subsequence included in the SSS occupies the same frequency domain resources.

23. The method according to any one of claims 15 to 22, characterized in that: The terminal device is a terminal device of the first type; the method further includes: receiving a first PBCH; wherein a bandwidth occupied by the first PBCH is wider than or equal to a bandwidth occupied by the synchronization signal.

24. The method according to claim 23, characterized in that The frequency domain resources occupied by the first PBCH include the frequency domain resources occupied by the synchronization signal.

25. The method according to any one of claims 15 to 22, characterized in that: The terminal device is the second type of terminal device; the method further includes: receiving a second PBCH; wherein a bandwidth occupied by the first PBCH is wider than a bandwidth occupied by the second PBCH.

26. The method according to claim 25, characterized in that The frequency domain resources occupied by the synchronization signal include the frequency domain resources occupied by the second PBCH.

27. The method according to claim 25 or 26, characterized in that The synchronization signal includes indication information, and the indication information is used to indicate the time domain resources and / or frequency domain resources occupied by the second PBCH.

28. The method according to any one of claims 15 to 27, characterized in that: The synchronization signal includes a beam index, and the beam index is used by the terminal device to send data and / or signaling on the beam corresponding to the beam index.

29. A communication device, characterized in that: The communication device comprises: a synchronization signal determination module and a transceiver module; The synchronization signal determination module is used to determine a synchronization signal including a plurality of subsequences, wherein the plurality of subsequences constitute a long sequence, each of the plurality of subsequences is mapped to a subcarrier of orthogonal frequency division multiplexing OFDM, and a bandwidth of the synchronization signal is greater than or equal to a bandwidth of any subsequence of the plurality of subsequences; The transceiver module is used to send the synchronization signal to the terminal device, and the synchronization signal is used for the terminal device to perform downlink synchronization.

30. The communication device according to claim 29, characterized in that The number of subsequences included in the synchronization signal is the same as the length of each subsequence included in the synchronization signal.

31. The communication device according to claim 29 or 30, characterized in that: The subsequence included in the synchronization signal is the longest linear shift register sequence or the multi-phase sequence.

32. The communication device according to claim 29 or 30, characterized in that: The first subsequence included in the synchronization signal is a multi-phase sequence; the general term of the first subsequence satisfies the following formula: Among them, a, b, c, d, p, q are constants; n=1, 2, ..., N, N represents the length of the first subsequence, and N is a positive integer; k=1, 2, ..., K, K represents the number of subsequences included in the synchronization signal, and K is a positive integer.

33. The communication device according to any one of claims 29 to 32, characterized in that: The synchronization signal includes a primary synchronization signal PSS and / or a secondary synchronization signal SSS.

34. The communication device according to claim 33, characterized in that The number of subsequences included in the PSS is the same as the number of subsequences included in the SSS, and / or the length of each subsequence included in the synchronization signal is the same.

35. The communication device according to claim 33 or 34, characterized in that: Each subsequence included in the PSS or the SSS occupies the same time domain resources.

36. The communication device according to claim 33 or 34, characterized in that: Each subsequence included in the PSS occupies the same time domain resources, and each subsequence included in the SSS occupies the same frequency domain resources.

37. The communication device according to any one of claims 29 to 36, characterized in that: The transceiver module is further used to send a first physical broadcast channel PBCH; wherein the bandwidth occupied by the first PBCH is wider than or equal to the bandwidth occupied by the synchronization signal.

38. The communication device according to claim 37, characterized in that: The frequency domain resources occupied by the first PBCH include the frequency domain resources occupied by the synchronization signal.

39. The communication device according to any one of claims 29 to 38, characterized in that: The transceiver module is further used to send a second PBCH; the bandwidth occupied by the first PBCH is wider than the bandwidth occupied by the second PBCH.

40. The communication device according to claim 39, characterized in that The frequency domain resources occupied by the synchronization signal include the frequency domain resources occupied by the second PBCH.

41. The communication device according to claim 39 or 40, characterized in that: The synchronization signal includes indication information, and the indication information is used to indicate the time domain resources and / or frequency domain resources occupied by the second PBCH.

42. The communication device according to any one of claims 29 to 41, characterized in that: The synchronization signal includes a beam index, and the beam index is used by the terminal device to send data and / or signaling to the communication device on the beam corresponding to the beam index.

43. A communication device, characterized in that: The communication device comprises: a transceiver module and a synchronization module; In the case where the communication device is a communication device of the first type, the transceiver module is used to receive a synchronization signal from a network device, the synchronization signal includes multiple subsequences, the multiple subsequences constitute a long sequence, each of the multiple subsequences is mapped to a subcarrier of orthogonal frequency division multiplexing OFDM, and the bandwidth of the synchronization signal is greater than or equal to the bandwidth of any subsequence in the multiple subsequences; the synchronization module is used to perform downlink synchronization according to the synchronization signal; or, In the case where the communication device is a communication device of the second type, the transceiver module is used to receive one or more subsequences in the synchronization signal from the network device; the synchronization module is used to perform downlink synchronization according to the one or more subsequences in the synchronization signal; The bandwidth of the signal received by the first type of communication device is wider than the bandwidth of the signal received by the second type of communication device.

44. The communication device according to claim 43, characterized in that The number of subsequences included in the synchronization signal is the same as the length of each subsequence included in the synchronization signal.

45. The communication device according to claim 43 or 44, characterized in that: The subsequence included in the synchronization signal is the longest linear shift register sequence or the multi-phase sequence.

46. ​​The communication device according to claim 43 or 44, characterized in that: The first subsequence included in the synchronization signal is a multi-phase sequence; the general term of the first subsequence satisfies the following formula: Among them, a, b, c, d, p, q are constants; n=1, 2, ..., N, N represents the length of the first subsequence, and N is a positive integer; k=1, 2, ..., K, K represents the number of subsequences included in the synchronization signal, and K is a positive integer.

47. The communication device according to any one of claims 43 to 46, characterized in that: The synchronization signal includes a primary synchronization signal PSS and / or a secondary synchronization signal SSS.

48. The communication device according to claim 47, characterized in that The number of subsequences included in the PSS is the same as the number of subsequences included in the SSS, and / or the length of each subsequence included in the synchronization signal is the same.

49. The communication device according to claim 47 or 48, characterized in that: Each subsequence included in the PSS or the SSS occupies the same time domain resources.

50. The communication device according to claim 47 or 48, characterized in that: Each subsequence included in the PSS occupies the same time domain resources, and each subsequence included in the SSS occupies the same frequency domain resources.

51. The communication device according to any one of claims 43 to 50, characterized in that: The communication device is a first type of communication device; the transceiver module is further used to receive a first PBCH; wherein the bandwidth occupied by the first PBCH is wider than or equal to the bandwidth occupied by the synchronization signal.

52. The communication device according to claim 51, characterized in that The frequency domain resources occupied by the first PBCH include the frequency domain resources occupied by the synchronization signal.

53. The communication device according to any one of claims 43 to 50, characterized in that: The communication device is a second type of communication device; the transceiver module is further used to receive a second PBCH; wherein a bandwidth occupied by the first PBCH is wider than a bandwidth occupied by the second PBCH.

54. The communication device according to claim 53, characterized in that The frequency domain resources occupied by the synchronization signal include the frequency domain resources occupied by the second PBCH.

55. The communication device according to claim 53 or 54, characterized in that: The synchronization signal includes indication information, and the indication information is used to indicate the time domain resources and / or frequency domain resources occupied by the second PBCH.

56. The communication device according to any one of claims 43 to 55, characterized in that: The synchronization signal includes a beam index, and the beam index is used by the communication device to send data and / or signaling to the network device on the beam corresponding to the beam index.

57. A communication device, characterized in that: include: A memory and a processor coupled to the memory, the memory being used to store a program, and the processor being used to execute the program stored in the memory; when the communication device is running, the processor runs the program so that the communication device executes the method described in any one of claims 1 to 14 above; or, the communication device executes the method described in any one of claims 15 to 28 above.

58. A communication system, characterized in that: The communication system includes a network device and a terminal device; wherein the network device is used to execute the method according to any one of claims 1-14, and the terminal device is used to execute the method according to any one of claims 15-28.

59. A computer-readable storage medium, characterized in that: A computer program is stored thereon, which, when executed by a computer, enables the computer to execute the method described in any one of claims 1 to 14; or, when executed by a computer, enables the computer to execute the method described in any one of claims 15 to 28.

60. A computer program product, characterized in that The computer program product comprises computer instructions, and when the computer instructions are executed on a computer, the computer is caused to execute the method according to any one of claims 1 to 14, or the computer is caused to execute the method according to any one of claims 15 to 28.

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